Hi mackshell,
Welcome to the Heartland Owners Forum and to the family. We have a great bunch of folks here with lots of information and all willing to share their knowledge when needed.
I suggest you call Heartland Customer Service, 574-262-8030 or 877-262-8032, have your VIN when you call. I think, but don't know for sure that the rear door/ramp is different if the patio/deck package was not ordered.
Be sure and check out our Heartland Owners Club. Join us at a rally when you can and meet lots of the great folks here and make friends for a lifetime.
Enjoy the forum.
Jim M